kono suupu ni ha syouga to negi ga haitte imasu.

This is a very common question.

に marks the place where something exists or is contained, and は marks the topic.

So このスープには means something like:

• in this soup
  • as for it

A natural way to understand it is:

• As for this soup, it has ginger and green onion in it
• or In this soup, there is ginger and green onion

The は often gives a slight topic or contrast feeling. Without は, このスープにしょうがとねぎが入っています is also grammatical and simply states what is in the soup.

この is a determiner, so it must come before a noun:

• このスープ = this soup

これ is a pronoun, so it stands by itself:

• これはスープです = This is soup

So you use:

• この + noun
• これ by itself

Because they are the things that are in the soup.

The verb 入っています describes existence/being contained, so しょうがとねぎ are the things being identified as present. That is why they take が.

A helpful way to think about it:

• このスープには = as for this soup / in this soup
• しょうがとねぎが = ginger and green onion are the things in it
• 入っています = are in it / are contained in it

So が marks what exists or what is contained.

Because 入る is an intransitive verb.

• 入る = to enter / to go in / to be in
• Intransitive verbs do not take a direct object with を

So you do not say:

• しょうがとねぎを入っています ✘

Instead, the ingredients are treated as the things that are present, so they take が:

• しょうがとねぎが入っています

If you wanted a transitive version, you would use 入れる:

• しょうがとねぎを入れます = add ginger and green onion

Here, 入っています means is in or is contained in.

It comes from:

• dictionary form: 入る
• ている form: 入っている
• polite form: 入っています

In many cases, 〜ている means an ongoing action, but with some verbs it describes a resulting state.

Here it does not mean the ginger and green onion are actively going into the soup right now.
It means the result is already true:

• they are in the soup
• the soup contains them

In this sentence, it is a state/result.

That is an important Japanese pattern:

• with some verbs, 〜ている = ongoing action
  
  • 食べている = is eating
• with other verbs, 〜ている = the resulting state
  
  • 結婚している = is married
  • 知っている = knows
  • 入っている = is inside / is contained

So here, 入っています means the ingredients are already inside the soup.

と is used to make a complete list.

So:

• しょうがとねぎ = ginger and green onion

It sounds like these are the ingredients being specifically named.

If you used や, the nuance would be less complete:

• しょうがやねぎ = things like ginger and green onion

So と is the normal choice when you want to say exactly what is in the soup.

It is understood as a combined subject: ginger and green onion.

Japanese does not mark plural the same way English does. There is no special plural ending here. The meaning comes from context.

Even though there are two items, Japanese still simply uses:

• しょうがとねぎが入っています

In English, we would naturally translate it with a plural idea:

• Ginger and green onion are in the soup

A useful breakdown is:

• このスープには = as for in this soup
• しょうがとねぎが = ginger and green onion
• 入っています = are in it / are contained

So the overall structure is:

• [location/topic] + [thing that exists/is contained] + [verb]

This is a very common Japanese pattern for existence or contents.

You can compare it to:

• 箱にはおもちゃが入っています = The box has toys in it
• かばんには本が入っています = There is a book in the bag

Yes, a little.

Compare:

• このスープにしょうがとねぎが入っています
• このスープにはしょうがとねぎが入っています

Both are grammatical.

The version with には sounds more like:

• As for this soup, it contains ginger and green onion
• In this soup, at least, there is ginger and green onion

So は can add topic marking, emphasis, or a slight contrast depending on context.

For example, it could imply something like:

• This soup has ginger and green onion in it
  (maybe another soup does not)

The spaces are just for learners.

Normally, Japanese is written without spaces:

• このスープにはしょうがとねぎが入っています。

Textbooks and study materials often add spaces to make the structure easier to see, especially for beginners.

So the spaced version is helpful for learning, but not standard everyday writing.

Yes, absolutely.

That is a very natural English translation.

Depending on context, these are all reasonable:

• This soup contains ginger and green onion.
• There is ginger and green onion in this soup.
• This soup has ginger and green onion in it.

They all match the Japanese well. The exact English wording depends on how natural you want it to sound in context.